Proteins

Cellulose is major component in plants while collagen in animals.

Explain the triple helical structure of the collagen.

Describe the formation of polypeptide bonds.

The short chain of amino acids that are linked by peptide bonds is called a polypeptide.

Write a short note on the fibrous proteins.

Write a note on the properties of fibrous proteins.

_____ (Lecithin/Pectin/Haemoglobin) is an example of globular protein.

Mention the properties of globular proteins.

Biuret Test is used for testing of _____ (lipids/proteins).

Biuret test is performed for the testing of carbohydrates.

The following diagram illustrates a common food test:

Identify the substance 'X'

Which fibrous protein is the major constituent of the fibrous protein? (Answer in a single word)

Amino acid analysis of two globular protein samples yielded identical composition per mole. Which one of the following characteristics is necessarily identical for the two proteins$?$

If the acidic, basic and hydrophobic residues of proteins are considered to be red, green and blue in colour, respectively, then a globular protein in aqueous solution would have

Which one of the following amino acids is least likely to be in the core of a protein$?$

Which one of the pairs of amino acids contains two chiral centres?

Arrange the following four levels of protein structures - Primary (I), Secondary (II), Tertiary (III), and Quaternary (IV) in a correct match:

Assertion (A): Glucose $+\mathrm{ATP}\stackrel{\text{ Hexokinase }}{⟶}$ Glucose $-6-$ Phosphate $+\mathrm{ADP}$.

Reason (R): The enzyme which catalyzes this reaction belongs to the enzyme class "transferase".

The correct answer is:

Identify the amino acids containing a hydroxyl group in their structure:
i) Cysteine
ii) Threonine
iii) Tyrosine
iv) Glutamic acid

The most abundant protein in the human body is _________.